Hybrid islanding detection method and priority-based load shedding for distribution networks in the presence of DG units

What is it about?

The installed DG units can supply either active power, or reactive power or both. In such a scenario, it is important to identify the unintentional islanding event early and accurately. With DG units, supplying both active and reactive power, the shortcomings of existing islanding detection techniques become prominent. Hence it is necessary to evolve new techniques to identify the islanding. To manage the identified islands, emergency control schemes need to be in place. The buses need to be identified by taking into consideration the presence of DG units in the system as well. In order to validate any load shedding scheme, the reliability of such scheme needs to be evaluated.

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Why is it important?

The islanding event is identified by utilizing the advantages of the existing passive islanding detection techniques. The vulnerable buses for load shedding in the island is identified by taking into consideration the presence of DG units in the system, the power available, the frequency and voltage decay. The most vulnerable buses are taken for load shedding. The effectiveness of the proposed load shedding scheme is tested by a quantitative reliability analysis before and after the proposed load shedding.

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